Radioreceiver



v I 626,370 Aprll 26, 1927 H. F. WORNER f RADIORECEIVER Filed Aug-21, 1924 5 Sheets-Sheet l INVINTOR o A1,626,370 Apnl 26. 1927- Y H, F, woRNER RADIORECEIVER Filed Ausl-2l, 1924 5 Sheets-Sheet 2 BMM April 26,1927. i.s26,31o

H. F. WORNER RADIORECEIVER -Fflled Aug.2l. 1924 5 Sheets-Sheet 3 Www/1%?,

April 26,1927. 1,626,370

H. F. WORNER RADIORECEIVER Filed Aug-21. 1924 5 sheets-sheet 4 f f M045@ 1,626,370 April 26' 1927 H. F. woRNE'R RADIORECEIVER Filed Anaal. 1924 5 sheets-sheet 5 Patented Apr. 26, 1927.

mY I'. WORKER, 0F PHILADELPHIA, PENNSYLVANIA.

BADIORECEIVER.

Application mea August 21, 1924. serial no. 783,315.

My' invention relates to new and useful improvements 1n a radio receiver, and hasfor one of its objects to simplify .the construction of such devices whereby the tuning may ybe accomplished through the medium of a single control preferably in the form of a lever or crank.;

Another object of this invention is to provide for coupling two variable condensers together whereby they will'be actuated in unison from a single control.

A further object of this invention is to provide an indicator associated with the tuning elements in -such manner that the wave length sett' of the tuning elements will be shown on t e indicator.

A still further object of the invention is to providea pilot light so connected in the filament circu1t of the vacuum tube or valve that said pilot light will be lit only when the above mentloned filament circuit is turned on.

Still another object of this invention isto provide pointers in connection with the control means operating in conjunction with a dial on which different' stations may be marked to indicate V the different settings of the tuning element whereby the wave lengths of diiierent stations may be tuned to without the necessi after a statlon has been once tuned in.

With these ends in view, this invention consists Vin the details of construction and combination of elements hereinafter set fprth and then specifically designated by the c aim.

In order that 'those skilled in the art to which this invention appertains, may understand how to make and use the same, I will describe its construction in detail, referring by numerals tothe accompanying drawings forming a part of this application, 1n w ic Fig. 1 is afront elevation of a radio receiver embodying the invention.

Fig. 2 is a rear elevation thereof.

Fig. 3 is a side elevation of the same.

Fig. 4 is an opposite side view thereof.

Fig. 5 is a diagram of the circuits ut1l1zed in the receiver herein illustrated.

Fig. 6 is a front elevation or front end view of the tuning elements per se showing the manner of coupling the two variable condensers and the relation thereof to the control orv operating means.

In carrying out the invention as here emof referring to the indicator.

bodied, 10 represents a panel of suitable material -and which supports the tuning elements preferably through the medium of'a sub-panel 11 and therefore will be thus described,4 although it will be obvious that the device orthe several parts thereof may be Asupported in' any well known or desirable manner. As herein illustrated the sub-panel 11 is attached to the main panel 10 by any suitable well known 'fastening devices 12,

such as screws and the necessary coacting nuts. Associated with the subanel 11 are two variable condensers 13 an 14 both of which are associated with the inductance coil 15 certain details of which will behere.- inafter more fully explained while the constructional data 1s set forth in detail in my application for patent, bearing Serial Number 689,582, dated January 30th, 1924. Both of the variable condensers include the ordi nary elements of devices of this character such as the stator or stationary plates 16, the rotor or' movable plates 17 each mounted on a shaft 18. The shaft of the condenser 14 has a control means or operating element 19 connected therewith which control is preferabl in the form'ofa double handle crank or ever as plainly shown in Fig. 6, while intermediate the ends of said double lever controller are a pair of pointers 20-21 pro-v jecting in opposite directions and adapted for movement' across the face of the dial 22 in an arcuate path, said dial being fixed to the outer surface of the panel 10. At the outer ends ofthe lever arms are fixed grips 23 or knobs whereby an operator may actuate the control from either end of the lever while at the center of said control lever is located a suitable knob 24 by which said control lever may be actuated if desired. This control lever is preferably connected with the shaft 18 of the condenser 14 by means of the socket 26 telesco ing over the end of the condenser shaft and ing held in proper adjustment by`a screw .27.

Because of the unique construction or arrangement of the coil or inductances it has been found that if the rotors of the two conally in use the rotor of one condenser may have a considerably dierent settin from the rotor of the other condenser a though their capacity will be substantially the same. y The rotors of the two condensers are coupled together by means .of two clamp arms 28 and 29 adjustably Jfastened to the rotor shafts of the condensers 13 and 14 respec-4 tively, by means of screws 30 or their equivalent, and a connector or link 31 having its ends pivotally Connected with the outer ends of the clamp arms 28 and 29, as shown in Fig. 6, and said clamp arms 28 and 29 are so located with respect to each other that there is no dead center and therefore the two rotors will not become locked From the foregoing description it will be i vseen that when the control means or operatingl lever 19 is actuated the'y rotors of the two condensers will be rotated in unison in fixed relation to vary their capacities in the same ratio, in other words, the plates of the rotors of both condensers will be withdrawn from or projected between the plates of the stators in unison as the control lever is rotated. c

In order to visibly indicate the wave Alength of the settings of the variable condensers, or in other words, the setting of the condensers at which they will receive broadcasts of certain-wave lengths, I provide an' indicator 32 comprising a dial and pointer one element of which is connected with the variable condensers and I do not wish to be has Wave length markings thereon visible through the sight opening 35 in the front panel 10 and as here shown these markings represent meters. l

across the sight opening 35 and the pointer 36, is shown as a hair line which may be produced on transparent" material disposed across the sight opening or it may be merely a thread, wire'or the like stretched across said sight opening.

The indicator being adjusted to the calibration` of the'condensers and moving in um- -son ,therewith for the wave length 4of a broadcasting station as known it isionl necessary to turn the control lever unti said indicator shows such wave length and if at that time such broadcasting station is on the air the broadcast program-will be received on theradio receiver. Because of the usual restricted area of the indicator dial the 1 markings must berestricted to about yevery ten meters so that for a station on 509 meters, for instance, it will be necessary to `This dial is rotatable shown onthe indicator'and .then by slowly moving the tuning element sli htly until the broadcast program is receive at its maximum. After this has been done the station maybe logged on the logging dial 22 by drawing a line on said dial oppositethe position of one of the pointers 20 of the tuning lever and marking. the same with the call letters of the station or the wave length and where two stations use the same wave length one station may be placed on the dial at one side of the horizontal diameter of the logging dial while the other station is marked on the other side horizontal diameter since the tuning element operates only a one-half revolution and therefore one of the pointers as 20 will coact with the markings on onehalf of the logging dial While the other pointer 21 will cooperate with the markings on the other half of Said logging dial.

The inductance coil 15 includes three inductances 37, 38 and 39, Fig. 5, and the inductance 37 lis connected by conductors 40 and 41 with the variablecondenser '13 so that said inductance is in series with the condenser land form a closed oscillatory circuit sometimes called an 1 absorption or ,losser circuit.

The primary inductance 38 is connected by a' conductor 42 with the aerial binding post 43 to which the lead-in wire from the antenna is connected in the usual manner and said inductance is also connected by a conductor 44 with the ground binding post 45, the latter having the ground wire connected therewith in the usual manner.

The ground binding post is connected by a conductor 46 with the binding post 47 which is for connection with 'the minus terminal of the A battery and in turn this binding post 47 is connected by a conductor 48 to a suitable rheostat49 while the other side of the rheostat is connected by a conductor 50 with a contact 51 of the liack 52 and another contact 53 is connected by a conductor 54 with one side of the filament of the vacuum tube or valve socket 55, the vacuum tube being represented by the n'umeral 56 in the diagram while the other side of the filament is connectedbya conductor 57 leading from the tube socket to the plus A battery binding post 58, said binding post also adapted .for connection with the mmus terminalof the B battery.

lThe binding post 59 to which the plus terminal of the B battery is connected has one end4 of a conductor 60 connected thereto whichl conductor leads to the contact 6l of thejack. l

One side ofthe secondary inductance 39 is `connected by a conductor 62 with the fixed condenser`63 which in turn is connected with the grid terminal of the vacuum tube by a conductor 64 while the other side of the move the tuning element until 510 meters issecondary inductance is connected by a. coudnctor with the plate terminal of the vacuum tube socket and across these connections is shunted the other variable condenser 14, preferably by'means of conductors 66 and 6T.

The plate circuit is connected by a conductor 68 with the contact 69 of the jack.

In the front panel 10 Ais located a socket 70 of a pilot lamp designated in the diagrammatic ,View by the numeral 7l and one side lof this pilot lamp socket is connected by a conductor 72 with the binding post 58 .which as before stated is adapted for connection with the plus terminal of the A battery While the other side of the pilot lamp socket is connected by a conductor.73 with the variable resistance 74 which in turn is connected by a conductor`75 with the contact 53 of the jack so as to be in the circuit leading to the minus terminal of the A bat; tery. Y

The use of the variable resistance in the pilot lamp circuit is shown only to illustrate the manner in which the voltage may be reduced -ori use with a relatively small pilot light so as to prevent or reduce the possibility of injury to said lamp and like-- wise reduce the current consumption thereof.

From this it will vbe seen that when the rheostat is actuated to turn on the filament current to the vacuum tubes, the pilot 1iv ht bein inshunt therewith will be lit wen the lament current is turned on and will thus indicate to the operator that the filaments of ie vacuum tubes are functioning properl Although I have described only a detector circuit it will be obvious that the ilot light may be connected with the am liying vacuum tubes so that unless all o said tubes are burning the pilot lamp lwill not light. This is essential as the vacuum tubes are enclosed with a cabinet behind thesolid front panel and cannot be seen by the operator. Such an arrangement alsol eliminates the necessity of connecting apertures either in the cabinet or panel.

From the foregoing description it will be noted that l have provided a radio receiver wherein the operator has but a single control for tuning said receiver to a broadcast wave and the desired Wavemay be immediately tuned to by reference to the wave length dial or the logging dial and through the medium of the pilot light the operator knows whether or not the vacuum tubes are lit without having to peer through peepholes oit-opening the cabinet. l

Of course l do not wish to be limited to 'the exact details of construction as herein shown as these may be varied within the limits of the appended claim without departing from the s irit of my invention.

Havmg thus fu ly described my invention, what I claim as new and usefulisz` A radio receiver including a pair-of vari-A able condensers having rotors carried by shafts, clamp arms loosely mounted on the shafts of the rotors, means pivotally connecting the. free ends of the clamp arms a predetermined distance apart, means securing;` the shaft engagingends 'of the clamp arms to the shafts whereby the rotors can be freed for the clamp arms and one another, and operating means connected-to the shaft of one rotor.

, In testimony whereof, I have hereunto affixed my signature;l

HENRY F. WORNER.

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